DEV: Convert ConditionalLoadingSpinner to gjs (#23565)

app/assets/javascripts/discourse/app/components/conditional-loading-spinner.gjs

@@ -0,0 +1,20 @@
+import concatClass from "discourse/helpers/concat-class";
+import eq from "truth-helpers/helpers/eq";
+
+const ConditionalLoadingSpinner = <template>
+  <div
+    class={{concatClass
+      "loading-container"
+      (if @condition "visible")
+      (if (eq @size "small") "inline-spinner")
+    }}
+  >
+    {{#if @condition}}
+      <div class="spinner {{@size}}"></div>
+    {{else}}
+      {{yield}}
+    {{/if}}
+  </div>
+</template>;
+
+export default ConditionalLoadingSpinner;

app/assets/javascripts/discourse/app/components/conditional-loading-spinner.hbs

@@ -1,5 +0,0 @@
-{{#if this.condition}}
-  <div class="spinner {{this.size}}"></div>
-{{else}}
-  {{yield}}
-{{/if}}

app/assets/javascripts/discourse/app/components/conditional-loading-spinner.js

@@ -1,15 +0,0 @@
-import Component from "@ember/component";
-import discourseComputed from "discourse-common/utils/decorators";
-
-export default Component.extend({
-  classNameBindings: [
-    ":loading-container",
-    "containerClass",
-    "condition:visible",
-  ],
-
-  @discourseComputed("size")
-  containerClass(size) {
-    return size === "small" ? "inline-spinner" : undefined;
-  },
-});